Neither Kerr Nor Thermal Nonlinear Response of Dye Doped Liquid Crystal Characterized by the Z-Scan Technique

Rodrı́guez-Rosales, Antonio A.; Ortega-Martı́nez, R.; Carrasco, M. L. Arroyo; Lara, E. Reynoso; Treviño‐Palacios, Carlos G.; Baldovino-Pantaleón, Oscar; García, R. Ramos; Castillo, M. D. Iturbe

doi:10.1080/15421400802241282

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…The nonlinear response of the samples was characterized using the z-scan technique. As it was demonstrated in a previous paper [20] that the nonlinear response of this type of samples is neither Kerr nor thermal. However, its nonlinear optical response is approximately described by a saturated Kerr-like nonlinearity.…”

Section: Z-scan Experimentsmentioning

confidence: 72%

“…However, its nonlinear optical response is approximately described by a saturated Kerr-like nonlinearity. Experimental characterization of the nonlinear response of these samples at 633 nm was made using a similar set up as the one described in [20]. Experimental results for an incident power of 4 mW and different input polarizations are shown in Fig.…”

Section: Z-scan Experimentsmentioning

confidence: 99%

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Polarization-dependent nonlinear phase contrast by using dye-doped nematic liquid crystals

et al. 2008

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Nonlinear phase contrast microscopy is an optical technique that uses an intensity-dependent refractive index material to produce high-contrasted images of transparent specimens. Earlier proposal of liquid crystals as phase filters for phase contrast applications used optically addressed spatial light modulators fabricated with photoconductive film. Here, we propose the use of a simpler planar nematic liquid crystal cell doped with 1% wt methyl red. Owing to their polarization dependent enhancement factor a tunable phase filter can be photoinduced efficiently. Thus, images of different degree of contrast (and even contrast reversal) can be obtained either by rotating the polarization vector. All optical real-time imaging of dynamic events can be performed and image processing such as edge enhancement is demonstrated.

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Section: Z-scan Experimentsmentioning

confidence: 72%

Section: Z-scan Experimentsmentioning

confidence: 99%

Polarization-dependent nonlinear phase contrast by using dye-doped nematic liquid crystals

et al. 2008

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“…This input window is also treated with an alignment layer to minimize the non-uniformity of the liquid crystal at the entrance and to maintain the polarization state of the incoming light. The cell is filled with the nematic liquid crystal 5CB doped with methyl red (MR) at 1% wt [2][3][4] and homeotropic and poled alignment. The light propagation in the cell is detected by a CCD camera adapted to a microscope objective (50x), to a phase controlller and a variable attenuator.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…The phenomenon was studied by using the polarization-dependent Z-scan technique [2][3][4]. Owing to the nonlinear effect of optical field-induced director reorientation, self-focusing of an optical beam can occur in nematic liquid crystals and an almost diffraction-compensated propagation can be observed with milliwatts of light power and propagation lengths of several millimeters [5].…”

Section: Introductionmentioning

confidence: 99%

Observation of the commutation between bright and dark spatial optical solitons

et al. 2011

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We report a new experimental technique on generation of both dark and bright optical spatial solitons in liquid crystals doped with organic dyes. In our recent works we have demonstrated that in some liquid crystals (LC's) the effective nonlinear refraction index (γ) is polarization dependent. Moreover, under certain conditions it is possible to realize inversion of γ, from γ > 0 to γ < 0, by proper adjustment of incident lightwave polarization. In this work we present experimental evidence that this LC is capable of supporting both bright and dark spatial solitons. The experimental setup used for characterization of solitons used two CCD cameras, which allowed us to analyze the longitudinal and transverse propagation characteristics of solitons in a glass cell containing a LC. It was possible to observe a clear correlation between the phase and the polarization state of incident light and the characteristic profile of the dark or bright soliton. The extreme values of the effective nonlinear refraction index were measured to be γ = -4.68 x 10 -10 cm 2 /W (dark spatial soliton case), and γ = 2.80 x 10 -10 cm 2 /W (bright spatial soliton). The key parameters of spatial solitons were estimated by using the nonlinear Schrödinger equation.

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Optical induction of Bessel-like lattices in methyl-red doped liquid crystal cells

Mantashyan

Drampyan

Beeckman

et al. 2015

Optics Communications

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Neither Kerr Nor Thermal Nonlinear Response of Dye Doped Liquid Crystal Characterized by the Z-Scan Technique

Cited by 7 publications

References 15 publications

Polarization-dependent nonlinear phase contrast by using dye-doped nematic liquid crystals

Polarization-dependent nonlinear phase contrast by using dye-doped nematic liquid crystals

Observation of the commutation between bright and dark spatial optical solitons

Optical induction of Bessel-like lattices in methyl-red doped liquid crystal cells

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